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A comparison of the experimental subsonic pressure distributions about several bodies of revolution with pressure distributions computed by means of the linearized theory
"An analysis is made of the effects of compressibility on the pressure coefficients about several bodies of revolution by comparing experimentally determined pressure coefficients with corresponding pressure coefficients calculated by the use of the linearized equations of compressible flow. The results show that the theoretical methods predict the subsonic pressure-coefficient changes over the central part of the body but do not predict the pressure-coefficient changes near the nose. Extrapolation of the linearized subsonic theory into the mixed subsonic-supersonic flow region fails to predict a rearward movement of the negative pressure-coefficient peak which occurs after the critical stream Mach number has been attained" (p. 1125).
Date:
November 5, 1951
Creator:
Matthews, Clarence W.
System:
The UNT Digital Library
Study of inadvertent speed increases in transport operation
From Summary: "Some factors relating to inadvertent speed and Mach number increases in transport operation are discussed with the object of indicating the manner in which they might vary with different qualities of the airplane and the minimum margins required to guard against reaching unsafe values. The speed increments and the margins required under several assumed conditions are investigated. The results indicate that, on a percentage basis, smaller margins should be required of high-speed airplanes than of low-speed airplanes to prevent overspeeding in inadvertent maneuvers."
Date:
November 16, 1951
Creator:
Pearson, Henry A.
System:
The UNT Digital Library
Some effects of frequency on the contribution of a vertical tail to the free aerodynamic damping of a model oscillating in yaw
The damping in yaw and the directional stability of a model freely oscillating in yaw were measured tail-off and tail-on and compared with the values obtained by theoretical consideration of the unsteady lift associated with an oscillating vertical tail. A range of low frequencies comparable to those of the lateral motions of airplanes was covered. The analysis includes the effects of vertical-tail aspect ratio and the two-dimensional effects of compressibility.
Date:
November 26, 1951
Creator:
Bird, John D.; Fisher, Lewis R. & Hubbard, Sadie M.
System:
The UNT Digital Library
Application of a channel design method to high-solidity cascades and tests of an impulse cascade with 90 degrees of turning
From introduction: "A technique for application of the channel design methods of reference 11 to the design of high-solidity cascades with prescribed velocity distributions as a function of arc length along the blade-element profiles is presented herein."
Date:
November 30, 1951
Creator:
Stanitz, John D. & Sheldrake, Leonard J.
System:
The UNT Digital Library